1975-05-12
1977-02-08
Claffy, Kathleen H.
H04B 320
Patent
active
040073416
ABSTRACT:
Echo canceller, canceling an echo signal y (t), generated by a signal x (t), comprising a transversal digital filter whose N weighting coefficients C.sub.i, correlated with N coded samples of x (t) enable the forming of a synthetic echo signal y (t) and comprising an adaptive control loop adjusting the coefficients C.sub.i, characterized in that the adaptive control loops effects the correlation between the signs of the N coded samples of x (t) and of the residual echo signal .gamma. (t) and determines the correction .DELTA. C.sub.i adjusting the coefficients C.sub.i by multiplication of the residual signal .vertline. .epsilon. (t) .vertline. by a coefficient .alpha. close to zero accompanied by the sign of the aforementioned correlation of signs.
REFERENCES:
patent: 3732410 (1973-05-01), Mackechnie
patent: 3735055 (1973-05-01), Thomas
patent: 3821493 (1974-06-01), Chiba
patent: 3836734 (1974-09-01), Campanella et al.
patent: 3894200 (1975-07-01), Campanella et al.
patent: 3922505 (1975-11-01), Hoge
Lajotte Dominique
Michelon Francois
Sourgens Jacques
Claffy Kathleen H.
Compagnie Industrielle des Telecommunications Cit-Alcatel
Myers Randall P.
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